Browser增加下载路径选择功能

/*add for download path choose*/
private void onInitdownloadSettingsPreference() {

        addPreferencesFromResource(R.xml.download_settings_preferences);

        PreferenceScreen downloadPathPreset =

                (PreferenceScreen) findPreference(PreferenceKeys.PREF_DOWNLOAD_PATH);

        downloadPathPreset.setOnPreferenceClickListener(onClickDownloadPathSettings());

        String downloadPath = downloadPathPreset.getSharedPreferences().

                getString(PreferenceKeys.PREF_DOWNLOAD_PATH,

                        BrowserSettings.getInstance().getDownloadPath());

        String downloadPathForUser = DownloadHandler.getDownloadPathForUser(this.getActivity(),

                downloadPath);

        downloadPathPreset.setSummary(downloadPathForUser);

    }

    private Preference.OnPreferenceClickListener onClickDownloadPathSettings() {

        return new Preference.OnPreferenceClickListener() {

            public boolean onPreferenceClick(Preference preference) {

                try {

                    Intent i = new Intent("com.android.fileexplorer.action.DIR_SEL");

                    GeneralPreferencesFragment.this.startActivityForResult(i,

                            DOWNLOAD_PATH_RESULT_CODE);

                } catch (Exception e) {

                    String err_msg = getResources().getString(R.string.activity_not_found,

                            "com.android.fileexplorer.action.DIR_SEL");

                    Toast.makeText(getActivity(), err_msg, Toast.LENGTH_LONG).show();

                }

                return true;

            }

        };

    }
/*end add */

public void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        mAdvFrag.onActivityResult(requestCode,resultCode, data);

        /*add for download path choose*/

        if (requestCode == DOWNLOAD_PATH_RESULT_CODE) {

            if (resultCode == Activity.RESULT_OK && data != null) {

                String downloadPath = data.getStringExtra("result_dir_sel");

                if (downloadPath != null) {

                    PreferenceScreen downloadPathPreset =

                            (PreferenceScreen) findPreference(PreferenceKeys.PREF_DOWNLOAD_PATH);

                    Editor editor = downloadPathPreset.getEditor();

                    editor.putString(PreferenceKeys.PREF_DOWNLOAD_PATH, downloadPath);

                    editor.apply();

                    String downloadPathForUser = DownloadHandler.getDownloadPathForUser(

                            this.getActivity(), downloadPath);

                    downloadPathPreset.setSummary(downloadPathForUser);

                }

                return;

            }

        }

        /*end add*/

    }

public void onCreate(Bundle savedInstanceState) {

        ......

        // Load the XML preferences file

        addPreferencesFromResource(R.xml.general_preferences);

        ......

        onInitdownloadSettingsPreference();//add for download path chhoose

    }